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Detection method for block effect

A detection method and block effect technology, which is applied in the direction of television, electrical components, digital video signal modification, etc., can solve problems affecting block effect, inaccurate detection results, etc., and achieve the effect of improving accuracy

Inactive Publication Date: 2009-07-01
POWERLAYER MICROSYST HLDG
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AI Technical Summary

Problems solved by technology

Because it is difficult to distinguish the brightness discontinuity in the image content from the brightness discontinuity of the block effect, that is, the image content will affect the judgment of the block effect, resulting in inaccurate final detection results

Method used

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  • Detection method for block effect
  • Detection method for block effect

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Embodiment Construction

[0014] The present invention will be further described below with reference to the accompanying drawings and in conjunction with the embodiments.

[0015] A block effect detection method of the present invention includes a block boundary position detection method and a block effect degree estimation method.

[0016] Figure 1 to Figure 3 The specific steps of the block boundary position detection method are shown, including:

[0017] 1) Input global pixel data.

[0018] 2) Calculate the horizontal (vertical) first-order difference for the global pixels, that is, calculate the absolute value of the brightness difference between two horizontal (vertical) adjacent columns (rows), such as the first column (row) and the second column (row) of pixels The absolute value of the brightness difference is taken as the horizontal (vertical) first-order difference value of the first column (row) pixel.

[0019] 3) Determine whether the local area in the horizontal (vertical) direction w...

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Abstract

The invention discloses a method for detecting blocking effect. The method comprises a block boundary position-detection method and a block effect level estimation method. The boundary position-detection method comprises the following steps: respectively calculating a horizontal first-order difference and a vertical first-order difference on global pixels; adopting prevention textures and edges as the conditions of judging block boundary, ; and obtaining the positions of vertical block boundaries and horizontal block boundaries through the calculation; the block effect level estimation methodcomprises the following steps: calculating the estimated value of integrated block effect level by utilizing a dimensional array obtained through the calculation of horizontal block boundary positions and vertical block boundary positions. The invention has the advantages that the accuracy of judgment result is greatly improved, the average statistical characteristics of image provided with no block effect part can be better presented because the denominator adopts the sum of average value and standard deviation during the calculation of the estimated value of the horizontal block effect level and the estimated value of the vertical block effect level.

Description

technical field [0001] The invention relates to digital image processing technology, in particular to an image block effect detection technology. Background technique [0002] Block-based image processing may introduce perceptible luminance and chrominance discontinuities at block boundaries, known as blocking artifacts. This discontinuity is caused by the independent processing of adjacent blocks in encoding and quantization. For example, most of the current international image / video compression standards, such as JPEG, MPEG, H.261, H.263, etc., all use block-based discrete cosine transform (BDCT, Block Discrete Cosine Transform) as the method of transform coding. Especially at low bitrates, such as Internet video, BDCT can produce blocking artifacts. [0003] Blockiness detection can provide the exact location of block boundaries (block localization) and evaluate the severity of blockiness (block evaluation), and its importance is mainly manifested in the following two a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N11/04H04N19/86
Inventor 郑旭刘雅闻石广建柳崎峰
Owner POWERLAYER MICROSYST HLDG
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